The OCM provides three electrical DS3 drops from a single or redundant OC-3 interface when used with an OPTI-3 chassis. The OCM may be installed in either a rackmount chassis or a wallmount chassis.

The OCM features include the following:

• SONET OC-3 LR-1 optical interface
  - Rate: 155.52 Mb/s
  - Span length: Long Reach, 40 km
  - Wavelength: 1550 nm (nominal)
• Dual SC optical connections
• Framing, multiplexing and mapping compliant with SONET standards
• OC-3 facility and equipment loopback
• Detects and indicates standard optical and SONET related alarms and conditions
• SONET level performance monitoring
• SONET line protection switching
• 1+1 equipment and facility protection for optical network interface
• 1:1 equipment protection for optical network interface
• Maximum 60 ms protection switching time (OC-3 to low speed interface)
• Board-mounted manual APS control switch
• Clear Channel DS3 signals (via BNC connectors)
• Two external DS1 BITS clock interfaces
• Three sense points including AUX1, AUX2, and AUX3
• Fully hot swappable
• External BITS, line, or free-run timing modes
• SONET Minimum Clock (SMC) with ±20 ppm accuracy
• OAM&P via data communication over Section DCC channel
• Support SONET section DCC bridging
• OSI/IP Tunneling
• Controller cards Cross Copy Communication Link
• OAM&P interface via craft interface (DB-9)
• TL1, Telnet, SNMP, and TFTP over Ethernet
• Local software downloads via craft interface (DB-9) and TFTP over Ethernet or OSI Tunnel
• TL1 management support
• Supports TL1-based GUI network management interface
• Three DS3 interfaces
• Software-controlled DS3 transmit level control
• Automatic receive equalization
• Software-controlled remote and local DS3 loopback capability
• Monitors incoming receive signal for Loss Of Signal (LOS)
• Monitors the receive analog and digital LOS
• Monitors transmit output signal for drive failure
• LED status indicators:
  - Board Status (Power/Fail)
  - Optic Status (LOL, LOF, etc.)
  - DS3 #1 Status
  - DS3 #2 Status
  - DS3 #3 Status
  - ACO
• External ACO input (RMC only)
• Three audible alarm outputs including critical, major, and minor (RMC only)
• Three visual alarm outputs including critical, major, and minor (RMC only)
• –20 VDC to –60 VDC input voltage range
• +20 VDC to +60 VDC input voltage range
• Power consumption between 7 and 10 watts (typical) per OCM
• Operating temperature range of –40°C to +65°C (installed in RMC)
• Operating temperature range of –40°C to +50°C (installed in WMC)
• Relative humidity up to 95%, noncondensing
• Storage temperature range –40°C to +85°C
• NEBS Level 3, GR-1089-CORE, GR-63-CORE, and UL60950 compliant
• Meets applicable optical and SONET standards (GR-253, T1.101, T1.105.xx)